[morzh]

Well....even today i can take an arrow Ohm-meter and tell you if an electrolytic cap is good or bad just using it alone.
I however much prefer to use a C-meter, and, when warranted, also measure leakage and such.

And in fact I knew a person who (having some genetically explained) high body resistivity could tell a live wire voltage just by holding in in his hand while touching the Earth with the other one.
I myself can tell a battery voltage up to 9V by putting my tongue to it

This said, unless the money is an issue, I always prefer tools created or at least well-suited for particular job, so it does not require adding my own personal special skills.

Now, if for what you do, this type of tester is sufficient, use it. If you feel you'd rather have direct answer to your questions, use another one.

Just an opinion.